Advancing or Delaying the Prayer from Its Time
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The second question of Fatwa No. ( 9069 )
Q2: If you arrive at the mosque and find a congregation praying one of the obligatory prayers, but the time for the prayer has not yet entered, and they are praying out of ignorance, such as being from outside the town or otherwise. The question: Is it permissible for you to pray with them when you know that the time has not yet arrived, and is their prayer valid if they become aware of the entry of the time?
A2: Do not join them in a prayer whose time has not yet entered, and inform them that the time for the prayer has not yet entered; so that they may be alert if they are mistaken, and make it clear to them that it is not valid. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Q2: If you arrive at the mosque and find a congregation praying one of the obligatory prayers, but the time for the prayer has not yet entered, and they are praying out of ignorance, such as being from outside the town or otherwise. The question: Is it permissible for you to pray with them when you know that the time has not yet arrived, and is their prayer valid if they become aware of the entry of the time?
A2: Do not join them in a prayer whose time has not yet entered, and inform them that the time for the prayer has not yet entered; so that they may be alert if they are mistaken, and make it clear to them that it is not valid. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.